通过URL下载网络资源

有URL可以通过url类下载相关文件资源

public class URLdown {
    public static void main(String[] args) throws Exception {
        String UrlStr = "https://p1.music.126.net/NQCtUkal5sPxK1Y25SW3-Q==/109951165303077538.jpg?param=34y34";
        String FileName = "oula.jpg";
        URL url = new URL(UrlStr);

        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        InputStream inputStream = urlConnection.getInputStream();
        FileOutputStream fos = new FileOutputStream(FileName);

        byte[] buffer = new byte[1024];
        int len;
        while ((len = inputStream.read(buffer)) != -1) {
            fos.write(buffer, 0, len);
        }
        fos.close();
        inputStream.close();
        urlConnection.disconnect();
    }
}

解释

• UrlStr是URL字符串
• FileName是需要保存的文件名
• 没有权限的文件会报403
• 与爬虫相似(大概)